<template>
	<view class="container">
		<!-- 空白页 -->
		<uniCartEmpty :hasLogin="hasLogin" :empty="empty"></uniCartEmpty>

		<view>
			<!-- 列表 -->
			<view class="cart-list">
				<block v-for="(item, index) in cartList" :key="item.id">
					<!-- item开始 -->
					<view class="cart-item" :class="{'b-b': index!==cartList.length-1}">
						<!-- 图片和多选按钮 -->
						<view class="image-wrapper">
							<image :src="item.image" :class="[item.loaded]" mode="aspectFill" lazy-load @load="onImageLoad('cartList', index)"
							 @error="onImageError('cartList', index)"></image>
							<view class="yticon icon-xuanzhong2 checkbox" :class="{checked: item.checked}" @click="check('item', index)"></view>
						</view>
						<!-- 描述 -->
						<view class="item-middle">
							<text class="clamp title">{{item.title}}</text>
							<text class="attr">{{item.attr_val}}</text>
							<text class="price">¥{{item.price}}</text>
						</view>
						<!-- 计数器 -->
						<view class="item-right">
							<uniNumberBox class="item-right-step" :min="1" :max="item.stock" :value="item.number>item.stock?item.stock:item.number"
							 :isMax="item.number>=item.stock?true:false" :isMin="item.number===1" :index="index" @eventChange="numberChange"></uniNumberBox>
							<!-- 删除按钮 -->
							<text class="yticon icon-fork item-right-del" @click="deleteCartItem(index)"></text>
						</view>
					</view>
				</block>
			</view>

			<!-- 底部菜单栏 -->
			<view class="action-section">
				<view class="allcheck">
					<view class="yticon icon-xuanzhong2 checkbox" :class="{checked: allChecked}" @click="check('all')"></view>
					<!-- <image 
						:src="allChecked?'/static/selected.png':'/static/select.png'" 
						mode="aspectFit"
						@click="check('all')"
					></image> -->
					<view class="clear-btn" :class="{show: allChecked}" @click="clearCart">
						清空
					</view>
				</view>
				<view class="total-box">
					<text class="price">¥{{total}}</text>
					<text class="coupon">
						已选中
						<text>122</text>
						件
					</text>
				</view>
				<button type="primary" class="no-border confirm-btn" @click="createOrder">去结算</button>
			</view>

			<!-- #ifndef MP -->
			<keep-alive>
				<uni-overlay></uni-overlay>
			</keep-alive>
			<!-- #endif -->
		</view>
	</view>
</template>

<script>
	import {
		mapState,
		mapMutations
	} from 'vuex';
	import uniNumberBox from '@/components/cart/uni-number-box.vue'
	import uniCartEmpty from '@/components/cart/uni-cart-empty.vue'
	export default {
		components: {
			uniNumberBox,
			uniCartEmpty
		},
		data() {
			return {
				total: 0, //总价格
				allChecked: false, //全选状态  true|false
				empty: false, //空白页现实  true|false
				cartList: [],
			};
		},
		onLoad() {
			this.loadData();
		},
		watch: {
			//显示空白页
			cartList(val, old) {
				let empty = val.length === 0 ? true : false;
				if (this.empty !== empty) {
					this.empty = empty;
				}
			}
		},
		computed: {
			...mapState(['hasLogin'])
		},
		methods: {
			/**
			 * Vuex
			 */
			...mapMutations(['changeSlider']),
			//请求数据
			async loadData() {
				let list = await this.$api.json('cartList');
				let cartList = list.map(item => {
					item.checked = true;
					return item;
				});
				this.cartList = cartList;
				this.calcTotal(); //计算总价
			},
			//监听image加载完成
			onImageLoad(key, index) {
				this.$set(this[key][index], 'loaded', 'loaded');
			},
			//监听image加载失败
			onImageError(key, index) {
				this[key][index].image = '/static/errorImage.jpg';
			},
			navToLogin() {
				uni.navigateTo({
					url: '/pages/public/login'
				})
			},
			//选中状态处理
			check(type, index) {
				if (type === 'item') {
					this.cartList[index].checked = !this.cartList[index].checked;
				} else {
					const checked = !this.allChecked
					const list = this.cartList;
					list.forEach(item => {
						item.checked = checked;
					})
					this.allChecked = checked;
				}
				this.calcTotal(type);
			},
			//数量
			numberChange(data) {
				this.cartList[data.index].number = data.number;
				this.calcTotal();
			},
			//删除
			deleteCartItem(index) {
				let list = this.cartList;
				let row = list[index];
				let id = row.id;

				this.cartList.splice(index, 1);
				this.calcTotal();
				uni.hideLoading();
			},
			//清空
			clearCart() {
				uni.showModal({
					content: '清空购物车？',
					success: (e) => {
						if (e.confirm) {
							this.cartList = [];
						}
					}
				})
			},
			//计算总价
			calcTotal() {
				let list = this.cartList;
				if (list.length === 0) {
					this.empty = true;
					return;
				}
				let total = 0;
				let checked = true;
				list.forEach(item => {
					if (item.checked === true) {
						total += item.price * item.number;
					} else if (checked === true) {
						checked = false;
					}
				})
				this.allChecked = checked;
				this.total = Number(total.toFixed(2));
			},
			//创建订单
			createOrder() {
				let list = this.cartList;
				let goodsData = [];
				list.forEach(item => {
					if (item.checked) {
						goodsData.push({
							attr_val: item.attr_val,
							number: item.number
						})
					}
				})

				uni.navigateTo({
					url: `/pages/payment/createOrder?data=${JSON.stringify({
						goodsData: goodsData
					})}`
				})
				this.$api.msg('跳转下一页 sendData');
			}
		},
		// #ifndef MP
		onNavigationBarButtonTap(e) {
			this.changeSlider()
		},
		// #endif
	}
</script>

<style lang='scss'>
	page {
		background: #f5f5f5;
	}

	/* 为了不使结算栏出现遮挡 */
	.container {
		padding-bottom: 134upx;
	}

	/* 购物车列表项 */
	.cart-item {
		display: flex;
		position: relative;
		padding: 16upx 40upx;
		margin: 10upx 0;
		background-color: #FFFFFF;

		/* 左侧图片和多选按钮 */
		.image-wrapper {
			width: 180upx;
			height: 180upx;
			flex-shrink: 0;
			position: relative;

			image {
				border-radius: 8upx;
			}
		}

		.checkbox {
			position: absolute;
			left: -16upx;
			top: -16upx;
			z-index: 8;
			font-size: 44upx;
			line-height: 1;
			color: $font-color-disabled;
			/* padding和backgroud加定位 - 实现圆弧效果 */
			padding: 4upx;
			background: #fff;
			border-radius: 50px;
		}

		/* 描述 */
		.item-middle {
			display: flex;
			flex-direction: column;
			flex: 1;
			overflow: hidden;
			position: relative;
			padding-left: 30upx;

			.title,
			.price {
				font-size: $font-base + 2upx;
				color: $font-color-dark;
				height: 40upx;
				line-height: 40upx;
			}
			.title{
				margin-top: 22upx;
			}
			.attr {
				font-size: $font-sm + 2upx;
				color: $font-color-light;
				height: 50upx;
				line-height: 50upx;
			}

			.price {
				height: 50upx;
				line-height: 50upx;
			}
		}

		/* 计数器 */
		.item-right {
			width: 180upx;
			position: relative;

			.item-right-step {
				position: absolute;
				left: 0;
				bottom: 30upx;
			}

			.item-right-del {
				position: absolute;
				top: 0;
				right: -22upx;
				padding: 4upx 10upx;
				font-size: 34upx;
				height: 50upx;
				color: $font-color-light;
			}
		}

	}

	/* 底部结算栏 */
	.action-section {
		/* #ifdef H5 */
		/* margin-bottom: 100upx; */
		/* #endif */
		position: fixed;
		left: 30upx;
		bottom: 30upx;
		z-index: 95;
		display: flex;
		align-items: center;
		width: 690upx;
		height: 100upx;
		padding: 0 30upx;
		background: rgba(255, 255, 255, .9);
		box-shadow: 0 0 20upx 0 rgba(0, 0, 0, .5);
		border-radius: 16upx;

		.allcheck {
			height: 52upx;
			position: relative;

			.checkbox {
				font-size: 58upx;
				color: #C0C4CC;
				position: relative;
				z-index: 5;
			}
		}

		.clear-btn {
			position: absolute;
			left: 38upx;
			top: 4upx;
			z-index: 4;
			width: 0;
			height: 52upx;
			line-height: 52upx;
			padding-left: 30upx;
			font-size: $font-base;
			color: #fff;
			background: $font-color-disabled;
			border-radius: 0 50px 50px 0;
			opacity: 0;
			transition: 0.2s;

			&.show {
				opacity: 1;
				width: 120upx;
			}
		}

		.total-box {
			flex: 1;
			display: flex;
			flex-direction: column;
			text-align: right;
			padding-right: 40upx;

			.price {
				font-size: $font-lg;
				color: $font-color-dark;
			}

			.coupon {
				font-size: $font-sm;
				color: $font-color-light;

				text {
					color: $font-color-dark;
				}
			}
		}

		.confirm-btn {
			padding: 0 38upx;
			margin: 0;
			border-radius: 100px;
			height: 76upx;
			line-height: 76upx;
			font-size: $font-base + 2upx;
			background: $uni-color-primary;
			box-shadow: 1px 2px 5px rgba(217, 60, 93, 0.72)
		}
	}

	/* 复选框选中状态 */
	.action-section .checkbox.checked,
	.cart-item .checkbox.checked {
		color: $uni-color-success;
	}
</style>
